14... e7c6 After this move, Fedoseev finds a very interesting tactical idea. 15. c3f6 Strategically, it's undesirable to exchange the bishop for the knight, but White has a concrete idea in mind. 15... h8f6  16. f3e5 This is the point. White will get Black's light-squared bishop, leaving his own light-squared bishop unopposed on the a8-h1 diagonal. 16... f6e5 